2006639 has 8 divisors (see below), whose sum is σ = 2055648. Its totient is φ = 1958400.

The previous prime is 2006623. The next prime is 2006651. The reversal of 2006639 is 9366002.

2006639 is nontrivially palindromic in base 8.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2006639 - 2⁴ = 2006623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2006659) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13214 + ... + 13364.

It is an arithmetic number, because the mean of its divisors is an integer number (256956).

2^2006639 is an apocalyptic number.

2006639 is a deficient number, since it is larger than the sum of its proper divisors (49009).

2006639 is a wasteful number, since it uses less digits than its factorization.

2006639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 2006639 is about 1416.5588586430. The cubic root of 2006639 is about 126.1313612800.

The spelling of 2006639 in words is "two million, six thousand, six hundred thirty-nine".